872706561 has 4 divisors (see below), whose sum is σ = 1163608752. Its totient is φ = 581804372.

The previous prime is 872706539. The next prime is 872706563. The reversal of 872706561 is 165607278.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 872706561 - 2⁵ = 872706529 is a prime.

It is a super-2 number, since 2×872706561² = 1523233483224893442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (872706563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145451091 + ... + 145451096.

It is an arithmetic number, because the mean of its divisors is an integer number (290902188).

Almost surely, 2^872706561 is an apocalyptic number.

It is an amenable number.

872706561 is a deficient number, since it is larger than the sum of its proper divisors (290902191).

872706561 is a wasteful number, since it uses less digits than its factorization.

872706561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290902190.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 872706561 is about 29541.6072853188. The cubic root of 872706561 is about 955.6292047920.

The spelling of 872706561 in words is "eight hundred seventy-two million, seven hundred six thousand, five hundred sixty-one".